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As of this writing, Google Analytics reports about 25% to 30% of my actual traffic. I tested this with two methods: comparing against the server logs and against custom code.

With the custom code, I first tracked users by a cookie, so I could tell if they were return visitors, etc. My numbers were very close to my server logs over the course of about a year. So if I show 4500 visitors for a given month, my custom code pretty much matches my server logs. But Google will show like 1000 visitors for the same period.

Despite so many people praising Google's accuracy and using the search engine, this is pretty typical. I was surprised at just how bad GA is, the GOOD part of GA is the dashboard, but a pretty dashboard is meaningless with garbage data.